Updated kubectl.sh (#5156)

The script is not usable unless you are in the '.vagrant/provisioners/ansible/inventory/artifacts' folder.
This update makes this usable from anywhere.

roles/kubernetes/client/tasks/main.yml

@@ -101,7 +101,7 @@
   copy:
     content: |
       #!/bin/bash
-      ./kubectl --kubeconfig=${BASH_SOURCE%/*}/admin.conf $@
+      ${BASH_SOURCE%/*}/kubectl --kubeconfig=${BASH_SOURCE%/*}/admin.conf $@
     dest: "{{ artifacts_dir }}/kubectl.sh"
     mode: 0755
   become: no